Hematuria is the most common clinical manifestation of IgA nephropathy. As IgA nephropathy is a chronic disease and not self-healing, the hematuria associated with it does not resolve on its own and will repeatedly occur or exacerbate. Typically, patients with IgA nephropathy exhibit microscopic hematuria when the condition is stable. However, gross hematuria may appear during physical exertion or respiratory infections, such as pharyngitis. In addition, IgA nephropathy patients also show increased urinary protein and can experience elevated blood pressure. Back pain is also a common clinical manifestation in patients with IgA nephropathy, so there is no need to be overly concerned about the presence of blood in the urine.